Commands
The display control instructions control the internal state of the PCF2119_RU/2（PHILIPS）
Instruction is received from MPU to PCF2119_RU/2（PHILIPS）for the splay control. The following
table shows various instructions.
X: Don’t care Table 6
D D D D D D D D
R
S
R
W
Instruction
B B B B B B B B
7 6 5 4 3 2 1 0
H = 0 or 1
Description
sets interface Data Length (DL) and
number of display lines (M); single
line/MUX 1 : 9 (SL), extended instruction
set control (H)
reads the Busy Flag (BF) indicating
internal
D
L
S
L
Function set
0
0
0 0 0 1
0 M
H
Read busy flag
and address
counter
B
1
F
AC
operating is being performed and reads
address counter contents
Read data
Write data
1
1
1
0
read data
write data
reads data from CGRAM or DDRAM
writes data from CGRAM or DDRAM
H = 0
clears entire display and sets DDRAM
address 0 in address counter
sets DDRAM address 0 in address
counter; also returns shifted display to
original position; DDRAM contents
remain unchanged
Clear display
Return home
0
0
0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 1 0
I
sets cursor move direction and specifies
Entry mode set
Display control
0
0
0 0 0 0 0 0 1 / S shift of display; these operations are
performed during data write and read
0 0 0 0 0 1 D C B sets entire display on/off (D), cursor
D
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AZDISPLAYS [ AZ DISPLAYS ]
